The Knights captain left the field in distress in the 60th minute of Newcastle鈥檚 narrow 22-18 loss to the Raiders at McDonald Jones Stadium on Friday night.
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He was seen after the game in a moon boot and will go for scans over the weekend for what is believed to be a Lisfranc injury.
If it is confirmed as a Lisfranc his season will be over. But what is for certain is he won鈥檛 be part of Slater鈥檚 side for the series decider in just over a week.
If a midfoot sprain is confirmed, the best-case scenario would see the Knights star sidelined for two to six weeks.
But if it is as feared and scans reveal it is a high-grade injury, the 27-year-old would require surgery and would miss the remainder of the NRL season 鈥 a massive blow to the Knights鈥 slim chances of playing finals footy in 2025.
It comes after the fullback suffered a Lisfranc injury last season on his opposite foot, which required surgery and saw him miss 11 weeks of football.
Kalyn Ponga injury opens door for Reece Walsh Origin recall
Ponga鈥檚 injury has opened the door for Reece Walsh to earn an Origin call-up.
Walsh will line up against the Warriors on Saturday afternoon and a strong display will all but certainly see him recalled by Slater.
While Dolphins star Hamiso Tabuai-Fidow is another fullback option for Slater, but that move appears less likely.
Walsh has played five Origin games and if not being out with a knee injury early in the season, many believe he would have been Slater鈥檚 preferred No.1.
Walsh鈥檚 knee is still far from right with the fullback seen limping on several occasions during the Broncos鈥 34-28 comeback win over Cronulla last week.
However, the 22-year-old says it is getting better each week.
鈥淚t鈥檚 good, I was trying to hide it (laughs),鈥 Walsh said of his knee.
鈥淚t鈥檚 a work in progress. I am still trying to get used to the feel of it.鈥
NSW will have a home-ground advantage for the series decider, which will take place at Sydney鈥檚 Accor Stadium on Wednesday, July 9.